Regulating system for transformers



Aug. 25, 1931. K. NIEMANN'ET AL- 1,820,242

Rmuu'rme SYSTEM FOR mmsrommns Filed Feb. 2'7, 1929 /NVE/YTORS K2121.NIEMA/WV A TFORIYEY-S fill Patented Aug. 25, 1931 UNITED STATES PATENTOFFICE KABL NIEMANN AND mnnaam' LEU'I'ERITZ, OF BERLIN, GERMANY,ASSIGNORS TO THE FIRM SIEIENB BEINIGEB-VEII'A GESELLSCHAFT FURMEDIZINISCHE TECHNIK I. B. H, 01 BERLIN, GEBILNY mvna'rmc' arm: :03raansroaxnns Application mea'l'ebmry :1 me, man Io. mam, and in GermanyKay 2a, 1928.

This invention relates to improvements in transformers and hasparticular reference to a potential 'iegulatin system for transformers,especially used 1n X-ray works.

In high tension transformers, and particularly those used for thegeneration of X- rays, it is frequently desirable to be able to thepotential at a predetermined value without first putting the transformerinto m operation.

According to the present invention, the attainment of the above resultis accomplished in a highly simple and practical manner by theutilization of a voltmeter in series with a variable resistance, theadjustable control element of which is connected directly to that of thesubdivided primary winding of the transformer. v The inventive ideainvolved is capable of if recelvmg a. variety of expressions, some ofwhlch are shown in the accompanying drawings wherein Figs. 1 and 2 arediagrammatic views'of 'two dlfferent embodiments of the invention. as Byreference to Fig. 1, it will be seen that "the primary winding 6 issubdivided at various points which are connected to terminals numberedfrom 1 to 7, each adapted to be engaged by an adjustable control elementas such as the wiper h. 0ne terminal of said primary winding isconnected at point a, to the conductor 0 of the current supply while thewiper h is joined to the conductor f through the switch g.

A variable resistance d (ohmic or inductive) is bridged across theconductors e an f, one terminal being connected at c to conductor e.From the opposite terminal of the resistance toward the first namedterminal, the same is tapped at points 1 to 7, which are in the samedirection and in parallel with the terminals 1 to 7 of the primarywinding 5. A wiper z" engages the terminals 1 to 7 and has in seriestherewith the voltmeter k which, together with said wiper, is in parallel with the line connecting the conductor f with that end of theresistance adjacent the terminal 1. The two wipers kand a are directlyconnected b the link. 0 so that motion is transmitted rom one to theother of said wipers to set the same on corresponding terminals of thewinding 1) and resistance (Z to regulate the latter.

If the voltmeter k is so calibrated that it indicates the terminalvoltage (which is dependent solely upon the ratio of transformation ofthe transformer) of the secondary winding m, then the terminal voltageof said secondary winding m may be set on the voltmeter is beforeputting the transformer into operation through the medium of the switchg. 1

In accordance with Fig. 2, the windings b, m, of the transformer and theresistance (1 may, in a known manner, he made to be continuouslyvariable. Also the meter 70 may be indirectly connected to the powerconductors e, f as by means of a transformer n which controls thedeflections of the meter is in the event of alterations in the positionsof the control elements h, i.

What is claimed is:

1. In a transformer especially employed in X-ray apparatus and includinga subdivided primary winding, power conductors to one of which isconnected onerterlninal of said winding, a plurality of other terminalsfor said winding designating the subdivisions thereof, a control elementfor connecting any one of said other terminals to the other of saidconductors, a variable resistance connected to said conductors andincluding a plurality of terminals correspondingly arranged relative tosaid other terminals of the primary winding, a-second .con-

d trol element for the second mentioned group of terminals, a volt-meterbridging said power conductors in series with said second control memberand said resistance and means connecting said control elements foreffecting unitar operation between the same.

2. In a trans ormer especially employed in X-ray apparatus and includinga subdivided primary winding, power conductors to one of which isconnected one terminal of said winding, a plurality of other terminalsfor said winding designating the subdivisions thereof, a control elementfor connecting any one of said other terminals to the other of saidconductors, a variable resistance connected to said conductors andincluding a pluralityof terminals correspondingly ar-' ranged relativeto said other terminals 'of the primary winding, a second control eleament for the second mentioned groupof terminals, a volt-meter bridgingsaid power conductors in series with said second control member and saidresistance, means connecting said control elements for 'efiecting'umtary operation between the same, and a switch for controlling theconnection of the first named control element to the second namedconductor.

3. In a transformer especially employedin X-ray apparatus and includinga subdivided primary winding, power conductors to one of which isconnected one terminal of said winding, a plurality of other terminalsfor said winding designating the subdivisions thereof, a control elementfor connecting any one of said other terminals to the other of saidconductors, a transformer having one of its windings connected with saidconductors, the other winding being subdivided and comprising aplurality of terminals arranged correspondingly to the firstinentionedplurality of terminals, a subdivided resista-nce having a plurality ofterminals connected with the second-mentioned plurality of terminals, asecond control element for the second-mentioned plurality of terminals,a voltmeter in series with said second control element and saidsubdivided winding of the second-mentioned transformer, and meansconnecting said control elements for effecting unitary operation betweenthe same. 7

4. In a high tension transformer especially used in X-ray apparatus andhaving a subdivided primary winding, power conductors to one of whichone terminal of said winding is connected, an adjustable deviceincluding a control element for said winding, said control element beingconnected with the other of said conductors, a calibrated meter alsoconnected to said terminals through said power conductors for measuringthe secondary potential of the transformer, a second control element forsaid meter, said second control element being connected to the firstnamed control element, whereby there is effected such a regulation thatindications on said meter-are made dependent thereupon in a mannerwherein they vary proportionally with the voltage that is to bemeasured.

KARL NIEMANN. EHRHARDT LEUTERITZ.

